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False alarm at the Pentagon triggers brief shelter-in-place order

By Thomson Reuters Jun 11, 2026 | 10:17 AM

WASHINGTON, June 11 (Reuters) – A false alarm at the Pentagon following an air quality warning briefly triggered ​a partial shelter-in-place order on ‌Wednesday at the U.S. military’s headquarters, as first responders worked to rule out exposure to hazardous materials, officials said.

The lockdown applied ‌to ​several corridors of the ⁠five-sided building in ⁠Arlington, Virginia. Employees were told to stay put while tests were carried out to determine whether a faulty ​sensor was to blame.

Many employees outside the areas of concern were ⁠told to leave the ⁠building as a precaution, officials ​said.

“Earlier this morning, Pentagon occupants were notified ​of a potential air quality issue, ‌prompting immediate precautionary safety measures and evaluation. Subsequent testing confirmed no hazard exists, and normal operations have resumed,” ⁠said chief Pentagon spokesman Sean Parnell.

“We express our sincere appreciation to the first responders ⁠for their ‌swift actions to ensure ⁠the safety of all personnel.”

The ​Pentagon, ‌one of the world’s largest ​office buildings, ⁠was hit during the Sept. 11, 2001 al Qaeda attacks.

(Reporting by Phil Stewart, Doina Chiacu and Ryan Patrick Jones;Editing by David Ljunggren, Caitlin Webber and ​David Gregorio)